RuntimeError:Ninja is required to load C++ extensions

[123jyw]

When you run this statement ,python -m btcdet.datasets.multifindbestfit , the following error occurs No module named 'vasualize_utils'.
But I have vasualize_utils.py.

I solved this problem by adding a path, but the following problem arose。

[123jyw]

When you run this statement ,python -m btcdet.datasets.multifindbestfit , the following error occurs RuntimeError:Ninja is required to load C++ extensions.

[DheerajYarlagadda]

Try:
pip install Ninja

[DheerajYarlagadda]

If you have already installed Ninja but still facing the error:
sometimes it can be also due to permission issues, would recommend navigating to site packages and checking the permissions of ninja packages.